Thunderbirds

I had a dream with gigantic birds that crashed lightening and thunder and rained fire.

Thunderbird (n) -
In Native American mythology the Thunderbird is a sky god who creates thunder by flapping his wings and create lightening by opening his eyes. The Thunderbird is common to Native American cultures from the Algonquian to the Lakota to the Navajo to the Northwest coastal tribes.

In cryptozoology the Thunderbird is a real, rare, seldom sighted predatory bird (perhaps Pterodactyl) large enough to carry off a small deer or child.

In automobile circles the Thunderbird is a classic Ford car. In computers it is an open source email program that is way better than Microsoft's Outlook Express.